president obama vowing to bring those responsible to justice for the incident that u.s. authorities are treating as an act of terrorism. >>> gold stabilizes after suffering the biggest one-day sell off since 1980. stocks fall and germany's zew index suggesting sentiment is weaker than we expect approximated. >>> and spain's t-bill auction not impacted by market jitters. madrid just over 5 billion euros in three years. >>> softbank defending i ining for sprint in the wake of dish's offer. >> announcer: you're watching "worldwide exchange," bringing you business news from around the globe. >>> for the latest out of boston this morning, as we said, three people are dead, more than 140 are injured after two explosive devices went off just seconds apart near the finish line of the boston marathon monday afternoon. area hospitals say at least 17 of those injuries are critical. counterterrorism officials tell nbc news other devices were found at the scene, but safely disarmed. the fbi has taken the lead on the investigation, but authorities have shed no light on a possible moti